Pound steaks to ~1/4 in thick

Salt & pepper each side of the steaks

In a large skillet, on high heat, 2 Tbls oil & 2 Tbls butter, add 2 steaks, and cook only for about 30 seconds, so as not to over cook. Reserve.
Repeat cooking last 2 steaks and reserve.

Remove skillet from heat. Add shallots.
Return to heat and add cognac and stir.
Add parsley, mustard and Worcestershire sauce.
Add brother and stir.
Add remaining butter.

Sprinkle the steaks with pepper and pour the sauce over them and serve.